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Remove all the superfluous builders from mb_config_buckets.pyl

Background: http://g/chrome-browser-core-engprod/ItUSl2yOxIM

Bug: 1069975
Change-Id: I7f2735563d74408df5200a932ded5e3a82d291da
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2146236Reviewed-by: Stephen Martinis <martiniss@chromium.org>
Commit-Queue: Gregory Guterman <guterman@google.com>
Cr-Commit-Position: refs/heads/master@{#758595}